Add failure handling and logging improvements in genai workflow and s…

…cript

.github/workflows/genai-investigator.yml

@@ -0,0 +1,27 @@
+name: Trigger on Action Failure
+on:
+    workflow_run:
+        workflows: ["build"]
+        types:
+            - completed
+permissions:
+    actions: read
+    pull-requests: write
+jobs:
+    check_failure:
+        if: ${{ github.event.workflow_run.conclusion == 'failure' }}
+        runs-on: ubuntu-latest
+        steps:
+            - uses: actions/checkout@v4
+              with:
+                  submodules: "recursive"
+                  fetch-depth: 10
+            - uses: actions/setup-node@v4
+              with:
+                  node-version: "20"
+                  cache: yarn
+            - run: yarn install --frozen-lockfile
+            - name: compile
+              run: yarn compile
+            - name: genai investigator
+              run: yarn genai gai -prc --vars "failure_run_id=${{ github.event.workflow_run.id }}" --out-trace $GITHUB_STEP_SUMMARY

packages/sample/genaisrc/gai.genai.mts

@@ -1,9 +1,10 @@
 /* spellchecker: disable */
 import { Octokit } from "octokit"
-import { createPatch, createTwoFilesPatch, diffArrays, formatPatch } from "diff"
+import { createPatch } from "diff"
 
 const workflow = env.vars.workflow || "build.yml"
-const lsid: undefined = env.vars.success_run_id
+const ffid = env.vars.failure_run_id
+const lsid = env.vars.success_run_id
 const branch =
     env.vars.branch ||
     (await host.exec("git branch --show-current")).stdout.trim()
@@ -28,18 +29,20 @@ const ls = runs[lsi]
 console.log(
     `> last success: ${ls.id}, ${ls.created_at}, ${ls.head_sha}, ${ls.html_url}`
 )
-const ff = runs[lsi - 1]
+const ff = ffid ? runs.find(({ id }) => id === ffid) : runs[lsi - 1]
+if (!ff) cancel("failure run not found")
 console.log(
     `> first failure: ${ff.id}, ${ff.created_at}, ${ff.head_sha}, ${ff.html_url}`
 )
+if (ff.conclusion !== "failure") cancel("failure run not found")
 
 const gitDiff = await host.exec(
     `git diff ${ls.head_sha} ${ff.head_sha} -- . :!**/genaiscript.d.ts`
 )
 console.log(`> source diff: ${(gitDiff.stdout.length / 1000) | 0}kb`)
 
 // download logs
-const lsjobs = await downloadRunLog(ls.id)
+const lsjobs = await downloadRu nLog(ls.id)
 const lsjob = lsjobs[0]
 const lslog = lsjob.text
 console.log(